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Thermodynamic Study of the Interaction of Co(II)-Schiff Base Complexes with Phosphines

M. Asadi*, M. Mohammadikish^a and K. Mohammadi^b

aChemistry Department, College of Sciences, Shiraz University, Shiraz 71454, I. R. Iran
bChemistry Department, Faculty of Sciences, Persian Gulf University, Bushehr 75169, I. R. Iran

The equilibrium constants and the thermodynamic parameters for the interaction of CoL^x (L¹ = 5-OMe-salabza, L² = salabza, L³ = 5-Br-salabza and L⁴ = 5-NO₂-salabza) as acceptors, with phosphines (PBu₃, PPh₂Me) as donors in dichloromethane were studied. This was performed by using UV-Vis spectrophotometry titration for 1:1 adduct formation of the selected complexes at various temperatures (T = 283-298 K). The trend of the adduct formation of the Co(II) complexes with a given phosphine donor decreases as CoL¹ > CoL² > CoL³ > CoL⁴. The stability of the resulting adducts with different Co(II)-schiff base complexes found to decrease in the order PBu₃ > PPh₂Me.

Keywords: Cobalt, Schiff base, Equilibrium constant, Thermodynamic parameters